Induction regulator



Patented Mar. 22, 1949 UNITED STATES PATENT OFFICE 2,465,298 INDUQTION REGULATOR Lester G. Tubbs, Pittsburgh, Pa., assignor to Westinghouse Electric Pa., a corporation Application May 7,

3 Claims.

This invention relates to induction regulators. Induction regulators a stator and a rotor cooperating therewith and made to pre- Where succost of the regulator.

An object of this invention is to provide an induction regulator having a flexible drive which will prevent chattering of the gears of the drive.

Another object of this invention is to provide an induction invention will become apparent from the following description when taken in conjunction with the accompanying drawing, in which:

Figure 1 is a vertical sectional view with parts broken away of an induction regulator embodying the teachings of this invention; and

Fig. 2 is a view in section of a portion of the structure of Fig. 1 taken along the line IIII.

Referring to the drawing, this invention is illustrated as applied to an induction regulator Ill. The regulator comprises a stator winding [2 suitably mounted within a tank I4 and a cooperating rotor winding l6 carried by a vertical shaft l8. The vertical shaft I8 is supported in operative position within the tank M by means of supporting bearings 20 and 22, the latter being carried by a horizontal strap or plate 24 disposed within Or across the tank l4 near the upper Corpor of Pennsylvania ation, East Pittsburgh,

1946, Serial No. 667,756 (Cl. 171119) end of the shaft l8. The stator winding l2 and the rotor winding [6 are usually immersed in oil or other suitable dielectric liquid (not shown) in the tank 14, which completely encloses the regulator windings.

A motor 25 is carried within the tank low the cover (not shown) by the strap or plate shaft is in a prede- As illustrated, the upper end of shaft l8 terminates above the strap or plate 24 and carries a worm gear segment 30, which is engaged by the cooperates with the worm 32 of the train of gears, the segment 30 being secured to the shaft in any suitable manner, such as by a key (not shown).

According to this invention, the portion or section of the shaft l8 extending upwardly from the laminations 34 of I6 is grooved lengthan inductlon regulator, reference may be had to a 3%; inch diameter shaft, 36 /2 inches long, adapted to carry a core for the rotor 15%; inches long, which is provided with a fluted section 81%; inches long formed of six grooves inch wide and inch deep. Another shaft of the same diameter, 30 inches long, adapted to carry physical contact with the windings or supporting structure for the windings of the rotor and the flexibility of the shaft is not impaired.

In operation, it is found that the torsional vibration of the rotor is efficiently absorbed by the fluted section of the shaft I8, which has suflicient torsional flexibility to prevent the transmittal of the torsional vibration of the rotor to the gear drive. Thus, chattering of the gears of the gear drive is prevented and a quiet operation of the regulator is obtained. These results are obtained without any increase in the size of the regulator.

I claim as my invention:

1. In an induction regulator, in combination, a stator, a rotor disposed in cooperative relation with the stator and subject to torsional vibration due to interaction of electrical forces between the rotor and stator when the windings thereof are energized even though the rotor is stationary, a gear drive for intermittently driving the rotor, and a shaft connected to the gear drive and disposed to carry the rotor mounted thereon, the shaft being fluted longitudinally over a portion thereof between the drive and the mounting for the rotor to render the shaft sufficiently flexible to prevent transmittal of the torsional vibration of the rotor to the gear drive, the shaft having a solid core throughout its length for retaining lateral stiifness and strength in the shaft.

2. In an induction regulator, in combination, stator, a rotor subject to torsional vibration due to interaction of electrical forces between the rotor and stator when the windings thereof are energized even though the rotor is stationary, a gear drive for intermittently driving the rotor, a shaft connected to the gear drive and disposed to carry the rotor mounted thereon in cooperative relation with the stator, the shaft having a solid core throughout its length and a plurality of grooves disposed in spaced relation about its surface and extending longitudinally thereof a predetermined distance between the 'mounting of the rotor and the gear drive to render the shaft sufficiently flexible to prevent transmittal of the torsional vibration of the rotor to the gear drive. 3. In an induction regulator, in combination, a stator, a rotor subject to torsional vibration due to interaction of electrical forces between the rotor and stator when the windings thereof are energized even though the rotor is stationary, a gear drive for intermittently driving the rotor, a shaft connected to the gear drive and disposed to carry the rotor thereabout in cooperative relation with the stator, the shaft having a section fluted longitudinally thereof extending from within the rotor towards the gear drive to render the shaft sufiiciently flexible to prevent transmittal of the torsional vibration of the rotor to the gear drive, the shaft having a solid core throughout its length for retaining lateral stifiness and strength, and a sleeve of insulating material disposed in spaced relation about the fluted section of the shaft and in supporting relation with the rotor disposed thereabout to insulate the fluted section from the rotor.

LESTER G. TUBES.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS 

